Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Have a 10 year old Toro 824.. Has been a trouble free machine.. Mostly just oil changes and occassional belt tightening, oiling etc.. 

Today did the whole driveway and noticed the last pass I was not throwing snow like normal.  Determined that auger was not turning.  Impeller yes auger no.  Seemed the auger was slightly scraping the asphalt.  Raised it up using the guides it is free and can rotate by hand but while (by hand) I can turn the shaft from the impeller the auger is not driven?

I assume there is a gear inside the aluminum housing that may be bad?  Any assistance appreciated.  Is it replaceable by a not real handy mechanic?!